Sun Hemmi Teledyne 44CA-600 Versalog II

About June, 1973. The last Post Versalog II is made. The first Teledyne-Post Versalog II (new model number 44CA-600) appeared a little before then, in June 1972. For a long time, the last T-P Versalog we knew of had the date code WH (August 1972), but a recently acquired Versalog 44CA-600 example has surfaced with the date code XF, indicating June 1973 production.

Faber Castell 67/87

Plastic body simplex 15cm rule with 4-line cursor, two color (red/black) scale markings, and inch side ruler, reversible slide has S, ST, and T scales. Rule is self documenting on right hand side for all scales.

Faber-Castell 67/87 (front)

Faber-Castell 67/87 (back)

body: plastic

cursor: plastic

length: 15cm

Scales: 10 + ruler

Front scales: K, A [ B, Ci, C ] D, L

Back ruler scales: S, ST, T

Country of origin: Germany

year of manufacture: April 1959 [Date Code: 459]

Pickett N1006-ES

Pickett 5" Trigonometry Duplex Rule. This is the "Eye Saver" yellow version of this rule,

Pickett N1006-ES (front)

Pickett N1006-ES (back)

body: aluminium

cursor: nylon/plastic with metal screws

length: 5" (12.7cm)

Scales: 17

Front scales: K, A [B, ST, T, S, C] D, DI

Back scales: Ln, DF [CF, CIF, CI, C] D, L

country of origin: USA

year of manufacture: 1959

Pickett N600-ES

Pickett 5" Trigonometry Duplex Rule. This is the "Eye Saver" yellow version of this rule,

Pickett N600-ES (front)

Pickett N600-ES (back)

body: aluminium

cursor: nylon/plastic with metal screws

length: 5" (12.7cm)

Scales: 19

Front scales: LL1, A [B, ST, T, S, C] D, DI, K

Back scales: LL2, DF [CF, Ln, L, CI, C] D, LL3

country of origin: USA

year of manufacture: 1962-1964

The Scales

After seeing so many slide rules it may appear confusing to see so many scales close together one one slide rule. Here is a list of the most common slide rule scales.

Letter(s)

Description

Applies to

Colour

Orientation

Comments

C

Single Logarithmic, 1 Decade (1-10)

Multiplication, division

Black

left to right

Usually found on slide

D

Single Logarithmic, 1 Decade (1-10)

Multiplication, division

Black

left to right

Usually found on body

A

Double Logarithmic, 2 Decades (1-10-100)

Powers of 2 and Square Roots

Black

left to right

Usually found on body

B

Double Logarithmic, 2 Decades (1-10-100)

Powers of 2 and Square Roots

Black

left to right

Usually found on body

K

Triple Logarithmic, 3 Decades (1-10-100-1000)

Powers of three and Cube Roots

Black

left to right

L

linear scale (0-1)

Mantissa for Common (base 10) Logs

Black

left to right

S

Sine scale

Sines between 5.7° and 90°

Black

left to right

S(cos)

Cosine scale

Cosines between 5.7° and 90°

Red

right to left, combined with S scale

T

Tangent scale

Tangents between 5.7° and 90°

Black

left to right

ST

Single Decade 1-10, basic scale folded at 57.3

Sines, Tangents between 0.6° and 5.7°

Black

left to right

Ci

Inverted Single Decade 1-10

Red

right to left

Di

Inverted Single Decade 1-10

Red

right to left

Cf

Folded Single Decade 1-10

Black

left to right

Df

Folded Single Decade 1-10

Black

left to right

P

Pythagorean Scale

Black

left to right

LL1

Log-Log scale 1

Raising numbers to arbitrary powers

Black

left to right

LL2

Log-Log scale 2

Raising numbers to arbitrary powers

Black

left to right

LL3

Log-Log scale 3

Raising numbers to arbitrary powers

Black

left to right

Gauge Points

Often used numbers such as Pi, e, conversions and other ratios can be found as Gauge Points on some scales. Here is a list of common gauge points.